pg_restore

pg_restore

Restores a database from an archive file created by
pg_dump.

Synopsis

pg_restore [connection_option ...] [restore_option ...] filename

Description

pg_restore is a utility for restoring a database from an archive created
by pg_dump in one of
the non-plain-text formats. It will issue the commands necessary to reconstruct the database
to the state it was in at the time it was saved. The archive files also allow
pg_restore to be selective about what is restored, or even to reorder the
items prior to being restored.

pg_restore can operate in two modes. If a database name is specified, the
archive is restored directly into the database. Otherwise, a script containing the SQL
commands necessary to rebuild the database is created and written to a file or standard
output. The script output is equivalent to the plain text output format of
pg_dump. Some of the options controlling the output are therefore
analogous to pg_dump options.

pg_restore cannot restore information that is not present in the archive
file. For instance, if the archive was made using the "dump data as INSERT
commands" option, pg_restore will not be able to load the data using
COPY statements.

Note: The --ignore-version option is deprecated and will be removed in a
future release.

Options

filename

Specifies the location of the archive file to be restored. If not specified, the
standard input is used.

Restore Options

-a | --data-only

Restore only the data, not the schema (data definitions).

-c | --clean

Clean (drop) database objects before recreating them.

-C | --create

Create the database before restoring into it. (When this option is used, the
database named with -d is used only to issue the initial
CREATE DATABASE command. All data is restored into the database
name that appears in the archive.)

-d dbname | --dbname=dbname

Connect to this database and restore directly into this database. The default is to
use the PGDATABASE environment variable setting, or the same name as
the current system user.

-e | --exit-on-error

Exit if an error is encountered while sending SQL commands to the database. The
default is to continue and to display a count of errors at the end of the
restoration.

-f outfilename | --file=outfilename

Specify output file for generated script, or for the listing when used with
-l. Default is the standard output.

-F t |c | --format=tar | custom

The format of the archive produced by pg_dump. It is not necessary to specify the format,
since pg_restore will determine the format automatically. Format can
be either tar or custom.

-i | --ignore-version

Note: This option is deprecated and will be removed in a future
release.

Ignore database version checks.

-I index | --index=index

Restore definition of named index only.

-l | --list

List the contents of the archive. The output of this operation can be used with the
-L option to restrict and reorder the items that are restored.

-L list-file | --use-list=list-file

Restore elements in the list-file only, and in the order they
appear in the file. Lines can be moved and may also be commented out by placing a
; at the start of the line.

-n schema | --schema=schema

Restore only objects that are in the named schema. This can be combined with the
-t option to restore just a specific table.

-O | --no-owner

Do not output commands to set ownership of objects to match the original database.
By default, pg_restore issues ALTER OWNER or
SET SESSION AUTHORIZATION statements to set ownership of created
schema elements. These statements will fail unless the initial connection to the
database is made by a superuser (or the same user that owns all of the objects in the
script). With -O, any user name can be used for the initial
connection, and this user will own all the created objects.

Restore the named function only. The function name must be enclosed in quotes. Be
careful to spell the function name and arguments exactly as they appear in the dump
file's table of contents (as shown by the --list option).

-s | --schema-only

Restore only the schema (data definitions), not the data (table contents). Sequence
current values will not be restored, either. (Do not confuse this with the
--schema option, which uses the word schema in a different
meaning.)

-S username | --superuser=username

Specify the superuser user name to use when disabling triggers. This is only
relevant if --disable-triggers is used.

Note: Greenplum Database does not support user-defined triggers.

-t table | --table=table

Restore definition and/or data of named table only.

-T trigger | --trigger=trigger

Restore named trigger only.

Note: Greenplum Database does not support
user-defined triggers.

-v | --verbose

Specifies verbose mode.

-x | --no-privileges | --no-acl

Prevent restoration of access privileges (GRANT/REVOKE
commands).

--disable-triggers

This option is only relevant when performing a data-only restore. It instructs
pg_restore to execute commands to temporarily disable triggers on
the target tables while the data is reloaded. Use this if you have triggers on the
tables that you do not want to invoke during data reload. The commands emitted for
--disable-triggers must be done as superuser. So, you should also
specify a superuser name with -S, or preferably run
pg_restore as a superuser.

Note: Greenplum Database
does not support user-defined triggers.

--no-data-for-failed-tables

By default, table data is restored even if the creation command for the table failed
(e.g., because it already exists). With this option, data for such a table is skipped.
This behavior is useful when the target database may already contain the desired table
contents. Specifying this option prevents duplicate or obsolete data from being
loaded. This option is effective only when restoring directly into a database, not
when producing SQL script output.

Connection Options

-h host | --host host

The host name of the machine on which the Greenplum
master database server is running. If not specified, reads from the environment
variable PGHOST or defaults to localhost.

-p port | --port port

The TCP port on which the Greenplum Database master database server is
listening for connections. If not specified, reads from the environment variable
PGPORT or defaults to 5432.

-U username | --username username

The database role name to connect as. If not specified, reads from the environment
variable PGUSER or defaults to the current system role name.

-W | --password

Force a password prompt.

-1 | --single-transaction

Execute the restore as a single transaction. This ensures that either all the
commands complete successfully, or no changes are applied.

Notes

If your installation has any local additions to the template1 database, be
careful to load the output of pg_restore into a truly empty database;
otherwise you are likely to get errors due to duplicate definitions of the added objects. To
make an empty database without any local additions, copy from template0 not
template1, for example:

CREATE DATABASE foo WITH TEMPLATE template0;

When restoring data to a pre-existing table and the option
--disable-triggers is used, pg_restore emits commands to
disable triggers on user tables before inserting the data then emits commands to re-enable
them after the data has been inserted. If the restore is stopped in the middle, the system
catalogs may be left in the wrong state.

pg_restore will not restore large objects for a single table. If an
archive contains large objects, then all large objects will be restored.

See also the pg_dump documentation for details on limitations of
pg_dump.

Once restored, it is wise to run ANALYZE on each restored table so the
query planner has useful statistics.

Examples

Assume we have dumped a database called mydb into a custom-format dump
file:

pg_dump -Fc mydb > db.dump

To drop the database and recreate it from the dump:

dropdb mydb
pg_restore -C -d template1 db.dump

To reload the dump into a new database called newdb. Notice there is no
-C, we instead connect directly to the database to be restored into. Also
note that we clone the new database from template0 not
template1, to ensure it is initially empty:

createdb -T template0 newdb
pg_restore -d newdb db.dump

To reorder database items, it is first necessary to dump the table of contents of the
archive:

pg_restore -l db.dump > db.list

The listing file consists of a header and one line for each item, for example,